Ceiling slab



July 14, 1931. M. s. GOLDSMITH CEILING SLAB Filed June so, 1927 n 'IIIII IIA IM/vento@ /fax @diam/fb,

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2% V /L' "5MM Patented July 14, 1931 UNITED STATES MAX S. GOLDSMITH, OF CINCINNATI, OHIO CEILING- SLAB Application led .Tune 30,

This invention relates to building construction wherein fabricated ceiling slabs are employed with a ioor structure preferably of reinforced concrete and has for an object the provision of a ceiling slab which may be effectively united with the concrete floor during construction and without entailing the use of additional material or labor.

Another object is to provide a fabricated ceiling slab of the kind referred to which may be mounted on a temporary structure for receivingl a poured concrete floor, and which upon hardening of the floor, is effectively locked to the floor.

These and other objects are attained by the means described herein and disclosed in the accompanying drawings, in which:

Fig. 1 is a cross sectional elevation of a concrete ioor structure having ceiling slabs of the invention embodied therein.

Fig. 2 is a perspective view of a ceiling slab of the invention.

Fig. 3 is a cross sectional view taken on line 3-3 of Fig. 2.

Fig. 4f is a cross sectional elevation of a modified form of floor embodying the slabs of the invention.

The ceiling slabs 7 may be formed of any suitable composition which may include gypsum, or other suitable fire-proong material and which composition is adaptable to fabrication into sheets or slabs of convenient length and b-readth and of suitable thickness. The slab 7 is suitably formed to provide holes or apertures 8, the side walls 9 of which are divergingly inclined from the top face 10 toward the bottom face 11 of the slab- 7. The holes or apertures 8 may be square, as shown, or they may be given any other suitable shape. A plurality of holes 8 may be provided in each slab 7 in order that such slab may be effectively locked tok a concrete floor at a number of laces and in a manner hereinafter descri d. It will be understood that such apertures or holes need not extend entirely through the slab to the bottom face 11.

The ceiling4 slabs 7 are adapted for use with concrete forms of various kinds and serve to provide a plane continuous ceiling` surface in a practically finished condition.

192'?. Serial No. 202,565.

In erecting a floor and ceiling structure with slabs of this invention, a plurality of the slabs 7 may be positioned, with the edges 12 of adjacent slabs 7 in abutment, upon suitably supported centering boards o'r sofits 13. If desired the centering 13 may take the form of a temporary floor, as shown in Fig. 1, which is supported by stringers 14; and shoring 15. A concrete mass 16 is then poured over the top faces 10 of the abutting slabs 7 and this concrete enters the tapered holes 8 thereby providing concrete keys 17, which when hardened will effectively lock the slabs 7 to the concrete mass 16. It will be understood that any suitable reinforcing bars may be arranged upon the top faces 10 of the slab 7 prior to the pouring of concrete 16. The ceiling slabs 7 are adaptable to use in constructing av solid concrete floor in the manner just described and shown in Fig. 4. The slabs are also adaptable for use in concrete joist and floor construction as shown in Fig. 1. In such construction the slabs 7 are arranged as previously described and suitable means such as channels 18 are arranged upon them. Domes or tiles 19 are then mounted upon the channels 18 whereupon a mass of concrete 20 is poured over the domes, filling the spaces between domes and becomes bonded with the slabs 8 by means of integral keys 17. If desired any suitable reinforcing means may be positioned between adjacent side walls of domes 19 to insure greater strength of the concrete beams 21 and the mass 20. When the concrete masses are hardened and set, the temporary supporting structure is removed whereupon a continuous plane ceiling surface is attained for receiving decoration or a finishing plaster coating if desired. It will be noted that the bottom faces 22 of the concrete keys 17 may be disposed flush with the bottom faces 11 of the slabs.

The union between the fabricated slabs of the invention and the concrete floor must of necessity be perfect. This desirable feature is attained without additional labor and material.

Whatis claimed is:

1. As a new article of manufacture a thin flat rectangular iireproof slab having boundary edge faces disposed at right angles to its major faces and having apertures with divergent side walls extending through the slab at a distance from said edge faces.

l 2. As a new article of manufacture a ceiling slab comprising a thin fiat body of fireproof material having unbroken edge faces at right angles to the flat major faces and provided with apertures having undercut walls and spaced from the edge faces of the slab for forming retaining keys from a plastic mass received upon one face of the slab.

3. In a construction of the class described the combination with a temporary support, of a plurality of thin flat preformed slabs of ireproof material disposed on the support, each slab having extended parallel faces and thin edge faces at right angles thereto for complete abutment with the edge faces of adjacent slabs, said slabs having apertures with downwardly divergent walls disposed interiorly of each slab, and a mass of poured concrete disposed upon said slabs and entering the apertures for keying the slabs at a plurality of places to said concrete mass.

In testimony whereof, I have hereunto subscribed my name this 25th day of June, 1927.

MAX S. GOLDSMITH. 

